| Discovery[1] | |
|---|---|
| Discovered by | THYME (Rizzuto et al.) |
| Discovery date | 2020 |
| Primary Transit | |
| Designations | |
| HD 120411 b,Gaia DR2 6113920619134019456 b,TYC 7794-2268-1 b[2] | |
| Orbital characteristics | |
| Eccentricity | 0.059+0.193 −0.046[3] |
| 6.959503±0.000016d[3] | |
| Inclination | 89.34°+0.45° −0.54° (to plane of sky)[1] 5.8+2.8 −5.7° (to host star's equator, projected)[4] |
| 343.0+92.0 −140.0 °[3] | |
| Star | HIP 67522 |
| Physical characteristics | |
| 0.8984±0.0419RJ[3] | |
| Mass | <20ME[5] |
Meandensity | <0.10 g/cm3[5] |
| Temperature | 1174±21K[3] |
HIP 67522 b is ahot Jupiter exoplanet orbiting theG-type star[6]HIP 67522, located approximately 415light-years fromEarth[6] in the constellationCentaurus, discovered using theTransiting Exoplanet Survey Satellite (TESS). It is currently the youngest hot Jupiter discovered, at an age of only 17 million years;[1] it is also one of the youngest transiting planets of any type, and one of only four others less than 100 million years old (along withAU Mic b,V1298 Tau c,DS Tuc Ab andTOI-942 b) to have the angle between its orbit and its host star's rotation measured, at5.8+2.8
−5.7 degrees.[4] This planet, in turn, may help in knowing how other hot Jupiters form.
Due to its young age, it has not reached its final size. Also due to theKelvin–Helmholtz mechanism,[4] which occurs as a result of the planet itself cooling, its internal pressure drops, which will in turn cause the planet to shrink. Its final size will depend on the composition of itscore.[7]
There is also evidence that another planet might also be present in the planetary system.[1]
It was shown in 2024 that HIP 67522 b is one of the least dense known planets, with a density less than 0.10 g/cm3. It might have formed beyond the water-snowline, where the contamination by rocky andicy materials usually takes place.[5]
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